It seems that the temp more often goes up to 20-30's and that food is not as frozen when I check it. When temp goes up I check it for next couple of minutes and usually within 10 min the temp is back down to 7-9 below.

Check along the back and sides of the freezer for any vent-like openings that are covered or blocked by packages. There may be a sensor that's not getting air flow as it should. Although most upright freezers are now frost free, there still can be ice buildup in critical areas such as the thermal sensor or the fan. Can you tell if the fan is running?

Even if the compressor has failed, your frozen items will keep the temp down for several days. I suggest you move the frozen goods to a neighbor immediately. Meat or fish in particular quickly becomes unsafe to eat without at least refrigeration.

it could be that your fridge,freezer setting is not turned up high enough to keep the freezer cold enough.turn it up to setting number 5 at least and if that dont do it u could have a faulty thermostat.have it checked by a engineer.

Red Alarm Indicator Light
Under normal operating conditions, the internal temperature of the freezer will ensure the long-term conservation of the stored food. When such temperature rises above a certain level (-12 °C), the appliance will trigger an acoustic and light alarm. The light alarm is a blink red light (Red Alarm Indicator Light), while the acoustic alarm is an intermittent sound.
You can stop the acoustic alarm by pressing the Acoustic Signal Stop Switch once.

When switching on the freezer for the first time, the Red Alarm Indicator Light will blink until the internal temperature has reached a level required for the safe conservation of frozen food.

Fast Freeze function
If more than 3-4 kg of food is to be frozen:
1. Press the Fast Freeze Switch for 2-3 seconds to activate the fast-freeze function 6-24 hours before placing the fresh food in the freezer, the Yellow Fast Freeze Indicator Light will illuminate. The compressor will now run continuously, to ensure that the fresh food is frozen as quickly as possible.
2. It is possible to deactivate the function at any time by pressing the Fast Freeze Switch for 2-3 seconds.
3. Place the foods in the freezing compartments (indicated with graphics).
4. Once the food is completely frozen (it may take up to 24 hours) you can manually switch off the fastfreeze function by pressing the Fast Freeze Switch for 2- 3 seconds and the Yellow Fast Freeze Indicator light will also go out.
5. Move frozen food from the freezing compartments into the other compartments (storing compartments) to make room for another freezing.

If the Fast Freeze Switch is accidentally left on, the fast-freeze function will be automatically switched off 48 hours later. The Yellow Fast Freeze Indicator light will also go out.

I believe that you all understand. If you intend to freeze larger amount of food then certainly a few hours before some shopping switch on the fast freeze function.

Dado

alarm should go off when freezer reaches minus 18c or lower.

the problem is your tempertur sensors or your temp' control unit.

You need to check the temp in the freezer to make sure it's down to around 10 degrees. The alarm will go off much above that.

Most all cooling systems need to be in an ambient temp of about 60-65 degrees. If not, it needs a low ambient control. This helps keep the high side pressure high enough so you have the proper pressure drop accross the expansion device. This applies to coolers, freezers, a/c units, and so on. I also think, if it keeps things frozen like you want, where's the problem? You make have a control just acting stupid.

that's the same problem i incurred, i replaced the thermostat and the fan. seems to be working fine.

might have a defrost problem check to see if it is building up with on the back panel if it is you need a defrost timer or limiter or heater or fan

What is the temp in the freezer, sounds like temp is to low..no water should be coming out of freezer, sounds like may be defrosting Need to check the temp to make sure its cold enough.. thats what that alarm is for